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US 10,652,072 B2Granted
Systems, devices and methods for communicating data over circularly pulse-shaped waveforms
AssigneeBattelle Energy Alliance, LLC
InventorsHussein Moradi, Behrouz Farhang
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Abstract
Circularly pulse-shaped waveforms for communication systems are disclosed herein, including a single carrier modulation in which pulse-shaping is performed using a circular convolution by the transmitter for various modulation schemes. A transmitter, related method, and corresponding receiver are also disclosed for demodulation of the single carrier circularly pulse-shaped signal and data extraction.
Claims10
A method of generating a block of circularly pulse-shaped waveforms, the method comprising:
- receiving a string of data symbols with a processor of a transmitter;
- spreading the string of data symbols across a number of complex-valued sinusoidal tones in the frequency domain with the processor, each complex-valued sinusoidal tone of the number of complex-valued sinusoidal tones associated with a different subcarrier band;
- summing the complex-valued sinusoidal tones with the processor;
- circularly shifting and accumulating a result of the summing with the processor;
- generating an output signal with the processor by serializing a result of the circularly shifting and accumulating;
- and transmitting the output signal wirelessly via communication elements of the transmitter to a receiving device, wherein spreading the string of data symbols across a number of tones includes:
- applying an L-point fast Fourier transform (FFT) operation that is repeated K times to generate a vector in the frequency domain;
- and applying a pulse-shaping filter hf[k] to the vector in the frequency domain at a frequency band of interest.
5 more elements
A receiving device for processing a data signal exhibiting a single carrier modulation waveform, the receiving device comprising:
- a receiver including a processor, the receiver configured to:
- receive a data signal having a single carrier modulated circularly pulse-shaped waveform;
- generate estimates of data symbols □0 through sL-1 that are spread across a number of complex-valued sinusoidal signal tones responsive to performing a reverse signal synthesis to the data signal via a fast Fourier transform (FFT) demodulator block of the receiver;
- and
- perform interpolation among multi-tones associated with the data signal having the single carrier modulated circularly pulse-shaped waveform to compensate for carrier frequency offset (CFO) of the FFT demodulator block of the receiver for users of a multi-user network having different CFOs.
2 more elements
A receiving device for processing a data signal exhibiting a single carrier modulation waveform, the receiving device comprising:
- a receiver including a processor, the receiver configured to:
- receive a data signal having a single carrier modulated circularly pulse-shaped waveform;
- generate estimates of data symbols □0 through sL-1 that are spread across a number of complex-valued sinusoidal signal tones responsive to performing a reverse signal synthesis to the data signal via a fast Fourier transform (FFT) demodulator block of the receiver;
- remove cyclic prefix from the data signal;
- apply an IFFT to the received data signal;
- and
- apply a single-tap equalizer per each complex-valued sinusoidal signal tone in the frequency domain to reduce channel impact on the complex-valued sinusoidal signal tones of the received signal.
4 more elements
A communication system, comprising:
- a transmitter including a processor, the transmitter configured to:
- receive an input data signal including a vector of data symbols;
- expand a length of the vector to be equal to a length of a pulse shaping filter;
- generate an output signal exhibiting a single carrier circularly pulse-shaped waveform constructed by using a circular convolution for pulse shaping during synthesis of the data symbols of the input data signal;
- reduce peak-to-average-power-ratio (PAPR) of the output signal responsive to performing single carrier modulation of the input data signal using a pulse shaping filter in the frequency domain;
- and
- transmit the output signal including the single carrier modulated circularly pulse-shaped waveform;
- and
- a receiver including a processor, the receiver configured to:
- receive the output signal from the transmitter;
- and
- generate estimates of data symbols □0 through sL-1 that are spread across a number of complex-valued sinusoidal signal tones responsive to performing a reverse signal synthesis to the output signal via a fast Fourier transform (FFT) demodulator block of the receiver.
9 more elements
Dependencies are inferred from the claim text.